CN1130301A - Display surface and its producing method - Google Patents

Abstract

A display surface capable of improving contrast characteristics with respect to external light, which is formed on a transparent substrate 10 by forming a red filter, a green filter, and a blue filter RF, GF, BF, which are composed of fine particle pigment layers, and then A black matrix BM is formed thereon. In the hole portion of the black matrix BM, a red phosphor layer, a green phosphor layer, and a blue phosphor layer corresponding to the colors of the red filter, green filter, and blue filter RF, GF, and BF are formed. Color phosphor layers RP, GP, BP. Since a layer with a smaller particle size and a larger shrinkage force is formed first, the force acting on the lower layer can be reduced during the patterning process.

Description

Display surface and manufacturing method thereof

The invention relates to a display surface with a filter layer, especially a display surface applicable to a color picture tube.

The original practical color picture tube has a substrate with a fluorescent surface formed on the inner surface, and a funnel-shaped tube shell connected to the substrate, and the electron beam emitted by the electron gun arranged at the neck of the funnel body, The scanning is deflected under the action of the magnetic field generated by the deflection coil installed on the outer wall of the tube shell, so as to reproduce the image.

The fluorescent surface is formed on the inner surface of the fluorescent screen of the cathode ray tube. There is a black matrix composed of black pigment particles in holes in the shape of dots, square points or lines at predetermined positions, and the black layer embedded in the holes. It is composed of phosphor layers in the form of dots, square dots or lines.

Usually, in color picture tubes, in order to attenuate the reflection of external light and improve contrast, cathode ray tube fluorescent screens with low light transmittance, so-called tone substrates and dull substrates are often used. However, when such a cathode ray tube fluorescent screen is used, there are disadvantages such as suppression of reflection of external light, but also attenuation of light generated by phosphors.

A recent technology that attracts attention is the technology disclosed in Japanese Patent Laid-Open No. 5-275006, that is, between the phosphor layer and the fluorescent screen of the cathode ray tube, a pigment corresponding to the phosphor emission color of each phosphor layer is formed. The filter pattern composed of layers can suppress the reflection of the phosphor layer and improve the contrast.

FIG. 1 is a schematic cross-sectional view illustrating a conventional display surface. For example, as shown in FIG. 1, in order to manufacture red, green, and blue filters RF, GF, and BF and red, green, and blue phosphor layers RP, GP, and The fluorescent surface of the optical filter made of BP must be added in front of the fluorescent layer RP, GP, BP in the original known fluorescent surface manufacturing process, that is, the filter pattern patterns RF and GF are formed on the fluorescent screen side of the cathode ray tube. , BF process. Since this method has been proposed in recent years, it is mostly formed after the black matrix BM is formed on the inner surface of the fluorescent screen of the cathode ray tube, and then the filter pattern is formed before the phosphor layer is formed.

Japanese Unexamined Patent Publication No. 54-563 discloses another method for suppressing the above-mentioned reflection, that is, forming an optical interference film corresponding to the light emitted by the phosphor between the phosphor layer and the phosphor screen. However, the method of forming a layer of pigment particles corresponding to each phosphor is superior in terms of the number of steps and the price.

In the method of forming a filter pattern made of pigment particle layers between the phosphor layer and the phosphor screen, even if a phosphor screen with a high light transmittance is used, theoretically, the contrast and luminous brightness can be improved. However, since the optical filter pattern is formed between the phosphor layer in the cavity and the phosphor screen, the diffuse reflection of the black pigment particles cannot be suppressed, and the desired effect of suppressing external light reflection cannot be obtained. Therefore, there is a problem that good high luminance and high contrast cannot be obtained.

Moreover, in the conventional method of manufacturing a fluorescent surface with an optical filter attached, specifically, in the process of forming a pattern of a filter layer on a substrate on which a black matrix has been formed during manufacture, there is still a filter The black matrix under the optical layer (substrate side) will cause peeling problems.

In view of the above problems, the object of the present invention is to efficiently suppress the reflection of external light from the filter substrate with black matrix and the color picture tube. Furthermore, the object of the present invention is to provide a method for manufacturing a filter substrate and a color picture tube that does not cause black matrix peeling off during the manufacturing process.

The first aspect of the present invention is to have several phosphor layers on a transparent substrate, an optical filter layer containing color pigments corresponding to the luminous color of the phosphor layers on the transparent substrate side of the phosphor layers, and a black In the display surface of the black layer of pigment particles, the optical filter layer contains colored pigment particles with an average particle size of less than 0.2 μm, and is formed on a transparent substrate in the form of square dots, dots or lines, and the black layer contains this uniform The black pigment particles with a particle diameter of 0.2-5 μm are formed so as to cover the peripheral area of the aforementioned optical filter layer except the central portion of each dot or line.

The second aspect of the present invention is to provide a method for manufacturing a display surface, which has the steps of coating and drying a color pigment dispersion containing color pigment particles with an average particle size of less than 0.2 μm on a transparent substrate to form a color pigment dispersion. Liquid coating film, the process of forming a color optical filter layer in the form of square dots, dots or lines on the aforementioned coating film by means of wiring pattern formation, coating and drying the color optical filter layer containing an average particle size of 0.2-5 μm black pigment particle black pigment dispersion liquid to form a black pigment layer, the black pigment layer is subjected to pattern forming treatment, partly removes the black pigment layer except the peripheral area of the aforementioned pigment layer, to expose the color optical filter layer The process of forming a black matrix covering the peripheral area of each dot and line portion of the color optical filter layer in the center of each dot shape and line shape portion, and coating the suspension containing phosphor on the color optical filter layer A process of forming a fluorescent substance coating film with a pattern forming method to form a phosphor layer whose emission color corresponds to the color of the pigment contained in the optical filter layer in an arbitrary order on the optical filter layer.

In the present invention, since a filter layer made of fine-particulate pigments is formed between the black matrix made of black pigment particles and the substrate, the black pigment particles can suppress diffuse reflected light and improve the contrast characteristics of the display surface with respect to external light. . Therefore, if the display surface of the present invention is used, a color picture tube with good luminance and contrast can be obtained.

For the manufacturing method of the present invention, since the material with a smaller particle size is patterned, in the manufacturing process, when the upper layer pattern is formed on the formed pattern pattern, there will be no peeling phenomenon, so it can be obtained. Display surface and color picture tube.

The inventors of the present invention investigated the causes of problems such as i) the anti-reflection effect of external light cannot be obtained as expected, and ii) peeling occurs during the manufacture of the black matrix. studied.

The results are as follows. First, regarding the problem i), as the transmittance of the fluorescent screen made of the transparent substrate increases, the diffuse reflection by the pigment particles forming the black matrix is quite strong. Due to the influence of this diffuse reflection, it is difficult to obtain desired high luminance and high contrast even if an optical filter is used.

Specifically, the pigment particles contained in the optical filter layer formed between the fluorescent screen and the phosphor layer do not produce diffuse reflection because the average particle diameter is less than 0.2 μm, but the pigment particles contained in the black layer The black pigment particles are relatively large particles with an average particle diameter of 0.2-5 μm, so the black layer will diffuse and reflect external light. Due to the low light transmittance of the fluorescent screen used in the past, this diffuse reflection problem is not obvious, but with the high transmittance of the fluorescent screen, the black layer cannot effectively attenuate the diffuse reflection, which becomes very prominent.

Importantly, in a color picture tube having an existing filter substrate and a fluorescent surface with a filter attached, the black matrix must completely suppress diffuse reflection from the perspective of the black matrix as a non-light-emitting part, which is also impossible. One reason for obtaining the desired effect of suppressing reflection of external light.

For problem ii), the black matrix will peel off during the manufacturing process, which is caused by the different film shrinkage forces of the optical filter layer and the black matrix during the process of drying the coating film.

This is described in further detail below

If the shrinkage force is taken as P, the surface tension is taken as γ, and the radius of the gap is taken as r, then the force that causes the film to shrink during the drying process of the coating film can be expressed by the following formula I.

                                            ...

The smaller the particle size, the smaller the radius r of the void. Therefore, it can be seen from formula 1 that the smaller the particle size, the greater the shrinkage force P.

The average particle diameter of the pigment particles used in the optical filter layer is less than 0.2 μm, and on the other hand, the average particle diameter of the black pigment particles used in the black layer is 0.2-5 μm, so the contraction force of the black layer and The difference between the shrinkage forces of the optical filter layers is quite large. The reason for the peeling of the black layer is the difference between the shrinkage force of the black layer and the shrinkage force of the optical filter layer.

In summary, the present inventors have devoted themselves to suppressing the diffuse reflection of external light in the black layer, and are not affected by the contraction force of the optical filter layer. They have studied the solutions to the above-mentioned problems i) and ii), and finally obtained invented the invention.

The first aspect of the present invention is exactly a kind of several phosphor layers on the transparent substrate, the optical filter layer containing the color pigment corresponding to the luminescent color of the phosphor layers at the transparent substrate side of the aforementioned phosphor layers, and The display surface of the black base layer containing black pigment particles, and its optical filter layer contains colored pigment particles with an average particle size of less than 0.2 μm in the shape of square dots, dots or lines, and the black base layer formed on a transparent substrate contains The black pigment particles with an average particle diameter of 0.2-5 μm are formed to cover the peripheral area of the optical filter layer except for the dot-shaped or line-shaped central portion.

The original display surface is formed directly on the transparent substrate with a black layer, and there is no optical filter layer therebetween. However, the display surface of the present invention is formed with an optical filter layer at least on a part between the black layer and the transparent substrate layer. The optical layer, so the optical filter layer can suppress the diffuse reflection of external light in the black layer. Therefore, the contrast and luminance can be improved by using a color picture tube with such a display surface.

Here, if the optical filter layers of various colors are, for example, dot-shaped, there is a gap between the dots of the filter layer. Since the black matrix directly on the substrate is formed at the gap, and there is no optical filter layer, the optical filter layer is only formed on a part between the black matrix and the fluorescent screen. Correspondingly, if each When the optical filter layer of one color is in the shape of a line covering the entire substrate without gaps, since the optical filter layer is sandwiched between the black bottom layer and the substrate, the diffuse reflection of the black pigment particles on the entire substrate can be effectively suppressed. .

The second aspect of the present invention is to provide a method for manufacturing a display surface, which has the steps of coating and drying a color pigment dispersion containing color pigment particles with an average particle size of less than 0.2 μm on a transparent substrate to form a color pigment dispersion. Liquid coating film, pattern pattern formation is carried out to above-mentioned coating film, to form the procedure of the color optical filter layer that is square dot, dot or line shape, coating on the aforementioned color optical filter layer, drying contains the average particle diameter of 0.2-5μm black pigment particle black pigment dispersion liquid to form a black pigment layer, the black pigment layer is subjected to pattern forming treatment, partly removes the surrounding area of each dot or linear body of the aforementioned optical filter layer Black pigment layer, to form the process of exposing the central part of each dot shape and line shape body of the color optical filter layer, and covering the peripheral area of each dot shape and line shape body of the color optical filter layer, in the color optical filter layer A suspension containing phosphor is coated on the filter layer to form a phosphor coating film, and patterned on the aforementioned optical filter layer to form its luminous color in any order according to the color of the pigment contained in the aforementioned optical filter layer. The color corresponds to the phosphor layer process.

The color optical filter layer is a process of repeatedly applying a dispersion liquid containing color pigment particles and a resist to form a coating film with the number corresponding to the color, exposing the aforementioned coating film, and exposing the exposed Each color layer is formed by the process of developing the coating film. The colored optical filter layer obtained in this way, especially when it is in the form of dots, has gaps formed between the dots.

Also, the color optical filter layer can be produced as follows. For example, when an n-color optical filter layer is to be formed, a resist solution may be applied to form a resist film before the first pigment dispersion is applied. Exposing and developing the resist film to form a resist pattern located in the region where the second color optical filter layer is to be formed. On the resist pattern, the first pigment dispersion liquid is applied and dried to form a pigment dispersion liquid coating film. The resist decomposition liquid is suitably used on the aforementioned first pigment dispersion liquid coating film. Removing the pattern pattern of the resist film in the area where the second to nth color optical filter layers are to be formed and the coating film of the pigment dispersion liquid of the first color located thereon, exposing the substrate in the aforementioned area.

Subsequently, on the exposed substrate, the second pigment dispersion liquid is coated to form a second pigment dispersion liquid coating film, and the aforementioned pigment dispersion liquid coating film is exposed and developed, thereby patterning the second color optical filter layer Forming treatment. Similarly, the pattern forming process is repeated until the nth color optical filter layer is formed.

Since the gaps between the color optical filter layers obtained in this way have been buried by the first color optical filter layer, and there is no gap anymore, so when it is in the shape of a dot, use the latter method A better effect of suppressing the diffuse reflection of the black pigment particles on the display surface side can be obtained than the former method.

For example, the black matrix can be formed in the following manner.

A resist solution is coated on the color optical filter layer to form a resist coating film. Patterning treatment such as exposure and development is performed on the resist coating film to form a resist layer in the region of the phosphor layer near the center of each dot-shaped and linear-shaped body where the color optical filter layer is to be formed. Then, a black pigment dispersion liquid is coated on the color optical filter layer on which the resist layer has been formed to form a black pigment layer. A resist decomposing agent is appropriately used on the black pigment layer to remove the resist layer and the black pigment layer in the region where the phosphor layer is to be formed. In this way, the black matrix layer that exposes the region near the center of each optical filter layer and covers the peripheral region of the color pigment layer can be formed.

In the original method, the optical filter layer is formed on the formed black matrix layer, so it will be affected by the strong shrinkage force generated when the optical filter layer coating film is dried, so that the formed under it The black base layer is easy to peel off. However, in the manufacturing method of the present invention, the optical filter layer is formed before the black matrix, so the black matrix will not be affected by the contraction force of the optical filter layer. Moreover, the weak contraction force generated when the black layer is coated and dried will not cause the optical filter layer disposed thereunder to peel off. In other words, since the smaller the particle size, the greater the film shrinkage force during film formation, so in the production method of the present invention, a film with a larger film shrinkage force is formed first to reduce the force applied to the lower layer when the upper layer is patterned. force. Therefore, according to the present invention, it is possible to obtain a display surface without peeling off of the black matrix layer, thereby obtaining, for example, a fluorescent surface with a filter attached thereto.

For the colored pigment particles of the present invention, in order to allow the required light to pass through and obtain an optical filter with good transparency and film-forming properties, the average particle diameter should be from 0.005 μm to 0.2 μm, and when greater than 0.2 μm Diffusion will occur when the pigment is diffused, and on the other hand, from a practical point of view, the minimum particle size of the pigment should be around 0.005 μm. The particle diameter is more preferably 0.01 µm to 0.15 µm. Specifically, the pigments exemplified below can be used.

For example, the red pigment can be iron sesquioxide under the trade name Sikotranstrand L-2817 (particle size: 0.01 μm-0.02 μm, manufactured by BASF Corporation), and the trade name is Cromopha-Talred A2B (particle size: 0.01 μm, manufactured by Chiba Gaigi Co., Ltd.) anthraquinone-based material. The blue pigment may be cobalt aluminate (Al ₂ O ₃ -CoO) with a trade name of Cobalt Blu-X (a particle size of 0.01 μm to 0.02 μm, manufactured by Toyo Pigment Co., Ltd.), and a trade name of riono-rubru-FG- 7330 (particle diameter: 0.01 μm, manufactured by Toyo Inki Co., Ltd.) is a copper phthalocyanine-based material. The green pigment may be TiO ₂ -NiO-CoO-ZnO with a trade name of Daibirokisaid™ Grein #3320 (a particle size of 0.01 μm to 0.02 μm, manufactured by Dainichi Seika Co., Ltd.) and a trade name of Daibirokisaid™. Grein #3340 (particle size is 0.01 μ m ~ 0.02 μ m, manufactured by Dainichi Seika Co., Ltd., CoO-Al ₂ O ₃ -Cr ₂ O ₃ -TiO ₂ type, trade name is ダイビロキキサイドTM Grein ## CoO-Al ₂ O ₃ -Cr ₂ O ₃ -TiO ₂ class of 3420 (particle diameter is 0.01 μm-0.02 μm, manufactured by Dainichi Seika Co., Ltd.), and the trade name is ダイビロキキサイドTMグリ-ン# (particle diameter is 0.01 μm-0.02 μm, CoO-Al ₂ O ₃ -Cr ₂ O ₃ types, the product name is the chlorination of CoO-Al 2 O 3 -Cr 2 O 3 types (the particle size is 0.01 μm, manufactured by Dainichi Inki Co., Ltd.) Copper phthalocyanines, a copper bromide phthalocyanines material with a trade name of Fa-Sting Gry-N 2IYK (particle size: 0.01 μm, manufactured by Dainippon Inki Co., Ltd.).

The black second pigment particles preferably have an average particle diameter of 0.2 μm to 5 μm, and specifically, graphite particles can be used.

As can be seen from the above description, if the method of the present invention is used, even in the manufacturing process of the fluorescent surface, because the color optical filter layer formed by the smaller particle pigment layer of the particle size is formed earlier, so when the black layer is formed subsequently, That is, when the coating film formed by the larger particle size black pigment particles is subjected to pattern forming treatment, the pattern of the lower particle size pigment layer will not be peeled off, so that a good coating can be obtained. Fluorescent surface.

FIG. 1 is a schematic diagram illustrating a conventional display surface.

Fig. 2 (a) to (c) are the schematic diagrams that represent an example of the display surface of the present invention, wherein Fig. 2 (a) is a schematic plan view, and Fig. 2 (b) is a section along the line X-X in Fig. 2 (a) The cross-sectional view of the model, Fig. 2(c) is a cross-sectional view of the model along the line Y-Y in Fig. 2(a).

3( a ) to ( g ) are explanatory diagrams showing an example of the method of manufacturing the display surface of the present invention.

4( a ) to ( f ) are explanatory views showing another example of the manufacturing method of the display surface of the present invention.

5 is a schematic view showing another example of the display surface of the present invention, wherein FIG. 5(a) is a schematic plan view, and FIG. 5(b) is a model cross-sectional view taken along line C-C in FIG. 5(a).

Fig. 6 is a schematic diagram showing an example of a color picture tube obtained by using the display surface of the present invention.

Fig. 7 is a schematic cross-sectional view for explaining the fluorescent surface shown in Fig. 6 .

In the picture

10···Transparent Substrate

RF···Red filter layer

GF···Green filter layer

BF···Blue filter layer

BM···Black Bottom

RP···Red Phosphor Layer

GP···Green phosphor layer

BP···Blue Phosphor Layer

Hereinafter, specific examples of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)

Figure 2 (a) is a schematic plan view obtained when observing the optical filter layer and the position of the black matrix layer in the display surface formed by the dot-shaped optical filter layer and the black matrix layer on the transparent substrate from the substrate side, Fig. 2 (b) and (c) are the cross-sectional views of the model along the X-X section and Y-Y section in Fig. 2(a), respectively.

In Fig. 2 (a), the oblique line indicates the area where the black matrix exists, the circle surrounded by the dashed line indicates the cavity area where no black matrix exists, and the circle surrounded by the solid line indicates the area where the black matrix is formed. Areas of dotted optical filter layer. As shown in FIG. 2( a ), a red filter RF, a green filter GF, and a blue filter BF are formed adjacent to each other on a transparent substrate 10 . The red filter RF is made of a red pigment made of iron oxide particles with an average particle size of 0.01 μm, the green filter GF is made of a green pigment made of cobalt green with an average particle size of 0.01 μm, and the blue filter BF is made of A blue pigment composed of cobalt blue with an average particle size of 0.01 μm is formed.

2(b) and (c), on the optical filter layers RF, GF, BF composed of such color pigment particles, a layer composed of graphite particles is formed as a black matrix layer BM. In the central part of each dotted filter layer RF, GF, BF shown in Figure 2 (a), that is, in the circular area shown by the dashed line, as shown in Figure 2 (b), no black matrix is formed BM, and constitute the hole portion 20. The black matrix layer BM is formed so as to cover the peripheral area and the area between the filters of each color except for the cavity portion 20 in the center of the filter layers RF, GF, and BF of each color.

A black matrix layer BM is formed on the substrate 10 in the dot-to-dot region where the dot-shaped pigment particle layer is densely arranged but not buried, as shown in FIG. 2(C) . At this time, it is apparent from FIGS. 2(a) and (c) that at least in the region between the circle shown by the solid line and the circle shown by the dashed line, the optical filter layer is constructed between the black matrix layer BM and the black matrix layer BM. between the substrates 10.

When forming in this way, the front face of the black matrix covered by the particle pigment layer, i.e. the coverage of the substrate side, compared with the 0% coverage of the original structure, the particle pigment layer in the front of the black matrix in the display surface of the present invention Coverage can be increased by orders of magnitude.

An example of the method of manufacturing the display surface of the present invention will be described below.

3( a ) to ( g ) illustrate an embodiment of the manufacturing method of the display surface of the present invention.

First, as shown in FIG. 3( a ), a red pigment dispersion is coated and dried on one side of a clean transparent substrate 10 . Red pigment dispersion can be prepared by mixing iron oxide particles as red pigment with ammonium dichromate/polyvinyl alcohol photoresist. Subsequently, the red dot positions are exposed and developed to form a red filter layer RF.

Then, chrome blue used as a blue pigment was mixed with an ammonium dichromate/polyvinyl alcohol-based photoresist to prepare a blue pigment dispersion. After coating and drying the prepared blue pigment dispersion, the blue dot-like positions are exposed and developed to form the blue filter layer BF as shown in FIG. 3( b ). In the same manner, a green filter layer GF as shown in FIG. 3(C) can be formed using chrome green as a green pigment.

Then, as shown in FIG. 3( d ), a bisazide/polyvinylpyrrolidone resist is applied to form a resist film 32 . Then, exposure and development are carried out at green, blue, and red dot positions by conventional known methods to form resist film patterns 34R, 34G, and 34B as shown in FIG. 3( e ). As shown in Fig. 3 (f), the graphite dispersion 40 is applied to form a coating film, and an appropriate resist decomposing agent is used to decompose the resist film patterns 34R, 34G, 34B, and spray water at a high pressure of about 428 kg/cm ² development. The resist film patterns 34R, 34G, 34B and the graphite coating film formed thereon are removed so that, as shown in FIG. region, forming the black bottom layer BM.

Here, the components of the red pigment dispersion liquid, the blue pigment dispersion liquid, and the green pigment dispersion liquid are respectively as follows.

(Red pigment dispersion) シコトランスルツド L-2817 dispersion 8g Poval EC-40 (manufactured by Nippon Synthetic Chemical Industry) 0.9g ammonium dichromate (manufactured by Kanto Chemical) 0.05g water 0 g 1

(Blue Pigment Dispersion) Cobalt Blue-X Dispersion

(Green pigment dispersion) ダイビロキサイド TMグリ-ン dispersion liquid 8g Poval EC-40 (manufactured by Nippon Synthetic Chemical Industry) 0.9g ammonium dichromate (manufactured by Kanto Chemical Industry) 0.05g water 7 g

The color pigment dispersant can also be other reagents that can disperse pigments, such as anionic or nonionic suitable dispersants, and can also be mixed and used as required.

Anionic dispersants can be materials such as propylene, propylene-styrene, propylene copolymer, polycarboxylic acid, naphthalenesulfonic acid formaldehyde condensate, polyoxyethylene alkyl ether sulfate and the like. The non-ionic dispersant can be materials such as polyoxyethylene lauryl ether, polyoxyethylene derivatives, polyoxyalkylene alkyl ethers, polyoxyethylene nonylphenyl ether, polycondensed sorbitan monolaurate, and the like.

The photoresist film agent can be materials such as complex salt/polyvinyl alcohol, diazonium salt, etc./polyvinyl alcohol, schibazel, chromate/casein, and the like.

等等材料，以及它们的混合物。The resist decomposing agent used may be acids such as H ₂ SO ₄ , sulfamic acid, NHO _{3 ,} etc., peroxides such as H ₂ O ₂ , MnKO ₄ , KZO ₄ , NaIO _{4 ,} etc., or sulfur

and other materials, and mixtures thereof.

When the display surface is formed in this way, the formed patterns will not be peeled off during the forming process.

Moreover, the display surface obtained has a color optical filter layer composed of a particle pigment layer arranged between the black base layer and the substrate, so the black pigment particles can be used to reduce diffuse reflection and improve the contrast characteristics of the display surface.

When necessary, before the formation of the filter layer and the formation of the black layer, aliphatic silicon dioxide, water glass, etc. can be coated to form a protective film for the color optical filter layer. In order to improve the adhesion of the pigment particles of the black layer, materials such as silane coupling agent can also be coated.

(Example 2)

In above-mentioned embodiment 1, be at the gap between the dots of each color optical filter layer, form the black matrix that contains black pigment particle, but also can cover the filter layer that contains particle pigment on the whole substrate, and then A black matrix is formed thereon. 4( a ) to ( f ) are used to illustrate another example of the manufacturing method of the display surface of the present invention.

First, an ammonium dichromate/polyvinyl alcohol photoresist coating solution is coated on one side of a clean transparent substrate 10 to form a coating film. Subsequently, exposure and development are performed on the blue dot-like positions and the green dot-like positions so that resist film patterns 50G and 50B as shown in FIG. 4( a ) remain at the exposed positions.

Then as shown in Fig. 4 (b), coat, dry the red pigment particle dispersion liquid that the iron oxide of red pigment is formed, then peel off resist film pattern pattern 50G, 50B with disintegrating agent, to form Fig. 4 (c) Red filter RF in areas other than the green and blue dotted locations shown.

Chrome blue, a blue pigment, is mixed with ammonium dichromate/polyvinyl acid photoresist. Apply the mixed blue pigment dispersion liquid, expose and develop the blue dot-shaped positions, and form the blue filter BF as shown in FIG. 4( d ). In the same manner, the green filter GF can be formed using chrome green, as shown in FIG. 4(e).

Subsequently, a bisazide/polyvinylpyrrolidone photoresist is coated to form a resist film, and the exposure and development are performed at the green, blue, and red dot positions in the original known way to form a resist film. The etchant film pattern is coated with graphite suspension, treated with a decomposer, and developed to form a black base layer BM at places other than the green, blue, and red dot positions, that is, the holes 20 .

The filter substrate thus obtained, as shown in FIG. 4 (f), is configured with gapless filters RF, GF, and BF made of particle pigment layers on the substrate 10 side of the black matrix BM. Compared with Example 1, the diffuse reflection of the black matrix pigment particles constituting the black matrix can be further reduced.

(Example 3)

In the above embodiments, the dot-shaped optical filter layer is described, and other shapes of optical filter layers are shown here by way of example.

FIG. 5( a ) is a schematic diagram of a display surface having a linear black matrix viewed from the substrate side. The slashes indicate areas where a black matrix exists. Fig. 5(b) is a simulated sectional view taken along line C-C in Fig. 5(a). As shown in Figure 5 (a) and (b), in the display surface, there are formed on the substrate 10, substantially no gap filter layers RF, GF, BF in the shape of a line, and in these filter layers On the layers RF, GF, and BF, a linear black matrix layer BM is formed covering the peripheral area except the central portion of the filter layer.

The filter substrate of this embodiment can be produced in the same manner as the above-mentioned embodiment 1 or 2, so the phenomenon of pattern peeling will not occur during the forming process.

Compared with Example 1, the ratio of the fine particle pigment layer disposed between the black pigment particles and the substrate, that is, the coverage, in this example is higher, so the contrast ratio can be further improved compared with Example 1.

(Example 4)

Embodiments when the present invention is used in a color picture tube will be described below.

Fig. 6 is a partially broken sectional view illustrating an example of a color picture tube using the present invention. The color picture tube 60 in this embodiment has a glass envelope 61 capable of vacuum-exhausting gas inside. The tube case 61 has a neck 62 and a funnel 63 connected to the neck 62 . A cathode ray tube phosphor screen 10 made of frit glass is attached to the funnel portion 63 . Furthermore, a metal explosion-proof tape 65 is wound around the periphery of the side wall portion of the fluorescent screen 10 . An electron gun 66 capable of emitting a number of electron beams is disposed inside the neck 62 , and a phosphor surface 67 composed of a filter layer and a phosphor layer is formed on the inner surface of the phosphor screen 10 . Under the action of a magnetic field generated by a deflection yoke (not shown) mounted on the outer wall of the tube, the electron beam is deflected and scanned to reproduce an image.

Next, the structure of the fluorescent surface 67 will be described with reference to FIG. 7 . The phosphor surface 67 can be formed by, for example, forming a phosphor layer on the filter substrate in any one of Embodiments 1 to 3. As shown in Figure 7, the luminescent color can be formed in the hole part of the black base layer BM to correspond to the color of the red filter, green filter and blue filter RF, GF, BF composed of the particle pigment layer. The red phosphor layer, green phosphor layer and blue phosphor layer RP, GP, BP. The transmittance of the fluorescent screen 10 made of a transparent substrate is about 90%, so it is transparent.

For a color picture tube with such a fluorescent surface, the luminance of the phosphor layers RP, GP, and BP is proportional to the transmittance of the filters RF, GF, and BF of each color, and because the phosphor screen composed of the substrate has a Transparent, so it can reduce the attenuation of fluorescent light. On the other hand, each color filter has a low transmittance to light other than the light emitting component of the corresponding phosphor, and has a low transmittance to non-fluorescent light in external light (light incident on the substrate from the lower side of the drawing in FIG. 7 ). Light other than the bulk luminescent color, say red in the case of a red filter RF, will be attenuated at a rate twice that of the low transmittance. In this way, by attenuating the reflected portion of external light with each color filter, the contrast can be improved.

And, because it is the substrate side of the black pigment particles with an average particle diameter of 0.2 to 5 μm that constitutes the black layer BM, the red, green, and blue particle pigment layers with an average particle diameter of less than 0.2 μm are provided, so the number of substrates and interfaces can be reduced. diffuse reflection at . Since the diffuse reflection of the black pigment particles can be suppressed even if the transmittance of the substrate is high, a decrease in contrast can be prevented. Therefore, the filtering effect in front of the phosphor layer can be utilized to the maximum.

The phosphor surface of such a color picture tube can be obtained by forming a phosphor layer in the hole portion by a conventional method after forming a black matrix layer in the above embodiments.

As mentioned above, according to the present invention, since the filter layer made of particulate pigment is formed between the black matrix made of black pigment particles and the substrate, the diffuse reflection of the black pigment particles can be suppressed, and the reflection of the display surface can be improved. Contrast characteristics of external light. Therefore, when the display surface of the present invention is used, a color picture tube with good luminance and contrast can be obtained.

Moreover, since the fine particle pigment layer with a smaller particle size is first formed in the manufacturing process of the display surface, even if the coating film formed thereon by the larger black pigment particles is patterned After treatment, the pattern pattern of the fine particle pigment layer with a smaller particle size below it will not be peeled off, so that a display surface with good performance can be obtained.

Claims (8)

1. display surface, have some luminescent coating RP, GP, BP on the transparency carrier 10, the transparent substrate side of aforementioned phosphors layer, contain with optical lightscreening layer RF, GF, the BF of the corresponding color pigment of luminescent coating glow color and contain the black matrix layer BM of black pigment particle

It is characterized in that the optical lightscreening layer contains the color pigment particle of average grain diameter less than 0.2 μ m, and the side's of being point, round dot or linear be formed on the transparency carrier,

Black matrix layer contains the black pigment particle of average grain diameter 0.2 to 5 μ m, and forms in the mode that is covered with the neighboring area except that the central portion of aforementioned each point-like of optics filter layer or linear body.

2. display surface as claimed in claim 1, it is characterized in that aforementioned optics filter layer comprises the red optics filter layer RF that contains the red pigment particle, contain the blue optical filter layer BF of blue pigment particle and contain the green optics filter layer GF of viridine green particle.

3. display surface as claimed in claim 1 is characterized in that being embedded with the black pigment particle between the gap of aforementioned optics filter layer.

4. display surface as claimed in claim 1 is characterized in that aforementioned optics filter layer is not formed with the gap.

5. a display surface manufacture method is characterized in that it has

Coating, drying contain the color pigment dispersion liquid of average grain diameter less than the color pigment particle of 0.2 μ m on transparency carrier 10, forming the color pigment dispersion liquid films, aforementioned filming carried out the pattern-forming processing, with the colour optics filter layer RF of the side's of formation point-like, round point shape or linear, the operation of GF, BF

On aforementioned colour optics filter layer; Coating, drying contain the black pigment dispersion liquid that average grain diameter is the black pigment particle of 0.2 to 5 μ m; Form the black pigment layer; Aforementioned black pigment layer is carried out image forming to be processed; Part black pigment layer except removing aforementioned each point-like of colour optics filter layer or linear body neighboring area; And to expose each point-like of colour optics filter layer or linear body central portion; The mode that covers colour optics each point-like of filter layer or linear neighboring area forms the operation of black matrix layer BM

Apply the suspension-turbid liquid that contains fluorophor at the colour optics filter layer, the formation fluorophor is filmed, carry out pattern and form processing, on aforementioned optics filter layer, form the corresponding luminescent coating RP of pigment color contained in its glow color and the aforementioned optics filter layer, the operation of GP, BP in any order.

6. display surface manufacture method as claimed in claim 5, it is characterized in that aforementioned optics filter layer forms operation and comprises, adopt respectively the red pigment dispersion liquid that contains the red pigment particle as aforementioned color pigment dispersion liquid, the blue pigment dispersion liquid that contains the blue pigment particle, the viridine green dispersion liquid that contains the viridine green particle, carry out the formation operation of aforementioned optics filter layer in any order, the red optics filter layer RF that contains the red pigment particle with formation, contain the blue optical filter layer BF of blue pigment particle, and the green optics filter layer GF that contains the viridine green particle.

7. display surface manufacture method as claimed in claim 6, it is characterized in that aforementioned colour optics filter layer forms operation and comprises, coating contains the dispersion liquid of color pigment and resist to form the operation of coat film, operation to aforementioned coat film exposure, the operation that the coat film that exposed is developed, and carry out above-mentioned operation repeatedly corresponding to number of color.

8. display surface manufacture method as claimed in claim 5 is characterized in that aforementioned colour optics filter layer contains the first optical lightscreening layer and the second optical lightscreening layer,

Aforementioned colour optics filter layer forms operation and comprises, before applying first dispersible pigment dispersion, apply the operation that resist solution forms resist layer, aforementioned resist layer is exposed, develop, to form the operation of etchant resist pattern in the location that will form the second colour optics filter layer, on aforementioned etchant resist pattern, apply, dry aforementioned first dispersible pigment dispersion forms the operation that dispersible pigment dispersion is filmed, on filming, suitably uses aforementioned first dispersible pigment dispersion resist decomposed solution, removing the resist layer pattern of the location that will form the aforementioned second colour optics filter layer and the dispersible pigment dispersion of formation first color thereon films, to expose the operation of the substrate in the aforementioned areas, on the substrate that has exposed, apply second dispersible pigment dispersion, form the operation that second dispersible pigment dispersion is filmed, with being filmed, aforementioned dispersible pigment dispersion exposes, the mode of developing is carried out the operation that pattern-forming is handled to the second colour optics filter layer.

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